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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a10feebc0376ce093278c0f4f6cea9f06b49b4dbe008414f023fde23044447bf' 
  AND token = 'zbFlMZi3FbxlbXJmpp9oXIeUq1al3Sj8I7hWKqXfwdI=' 
  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"
    }
  }
}