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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a57b34f6bee24a48f2d4eb37f011357cadf2e935dfb1c17117c2e8b772282c4d' 
  AND token = 'oICGANr9ON1KsKrn8hwAc+2200B8UIjm2etBJtfJwQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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