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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41f2c777e60f0bd692b17a4b441ffc21595bb3e04be93656b6114663dbd4c8cf' 
  AND token = '2Xvu9H8Puh6ZzP1S6teHCQxdYtPBllfV5UWSyVcKe60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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