SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ddb6e15cbbb5acc96d8f39987836df602b207964baeed64b51cdb736d503d91' 
  AND token = 'Y+HklVxCB22IN86h9lIRGKrGfDTBrY7Dq6BJHJW4+Tg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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