SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0eba7e9dd0b9a45a682c8f165b7c1dab3eb493f5fbde914bf6d19309f896b06c' 
  AND token = 'xVVI3ChD2NKMPLZ1KpEx1Zq+HgPXtRYdWQWZ6uU2S7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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