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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4229aee251f063947687a16c9b6fe2985c7aade9a0a5ff641ca13d7c041b9bfd' 
  AND token = 'gl7MLB8BFF5F0K7UaXiIlSwohJO8WjDUU01ONUjpEnY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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