SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0746a3ad158782b80f67ca6fc650577114eb4edd536efc93c8f220890c6d06f8' 
  AND token = 'GZ7EmjP8T9AlkgA8qJtHwwJ5Z6VSluLX3lHGsMOFBFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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