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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d53e915dc4721d26dd248a289f1ad239d6efe92a35a42b11b1820ce2128aa32' 
  AND token = 'NfmYe5dRcEkAF3gLQTLZzL0zcxq/9Xjslo0tcPm1Q+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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