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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3723d2e3ba7cb4fd74de411d4dc0864f30b759ce87caf4d46da7e55082a63f8e' 
  AND token = 'FY6TpHNMClIlgC2oeBjQJDlcIYraPJYGrrtrCEUdFAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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