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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9376297331d8e6c4cf7ad0f651b6d78ede89319b11335a9d58ab4419f619bf25' 
  AND token = 'lLC+CsY81L+OZnnXAvWgUImfNMW3nGvPInOTaANRj+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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