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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d2db1b1062a91d0ea9bd8df31ab5ba19ae22c9c81aeb35a5327d8a83ee780b7' 
  AND token = 'wEI2E2XU5e4c7pFqVRmCET6h9r+UCS/pKA2vcWgv0HQ=' 
  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"
    }
  }
}