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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15ed3449ed04f31eec1e2abe7a3c7ca94af05d1fc302abb18f6d5f4b169c1794' 
  AND token = '2BleAMLPn/yAqGl4/QzsJ7d/uJY9Xc4tp2lbgMsAEqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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