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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd83d62d4c50223b1f317f1087dc52b748c2c13940eb35e89832e3cf87151b9e2' 
  AND token = 'Xkh5aEYS4shLmhtDZYJtDPJ+GmJNTbngFbTTCSup5gw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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