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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f13835695373806ae9aa103714161e52dd5e0701b46476995f6122733e6b5b60' 
  AND token = '1xQAZIImmkx63U8wPpRTtBwwuxBhdv3QdMf2SaPPOF4=' 
  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"
    }
  }
}