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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc54fd9ad62661746e4a35bc12cfca88ee9389a1f40cfae9140a6f6125871640' 
  AND token = 'OVmpyP+YALjFuebuCJEmulNU0/a0H0DVojFOt75A5gQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}