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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3c220f27efa7fc5d21cbe9f40f4eaaae656a37c5f960bf01caa6ef10562f9ad' 
  AND token = 'Q+KJPI/KH+eUlWTds00SuApzusxIv6TAlJkqmuXajaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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