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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c15464f991a096559744d1e9da786cf8242c322547cf93deed80e0f387af223b' 
  AND token = 'ZXQl9+M5BttCcwn+O9HV4fB8AtIFhD6JNMOTPNidjVw=' 
  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"
    }
  }
}