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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '342c84b26f322dd1197754e63013ab9c265e1a7e4785f64f92fb99260ac7cba7' 
  AND token = 'vjbC3oqew4eLbB5SjEpKCc4H2elFJtQyKSSFYOg7eII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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