SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e1775043659cf7c76986849e357f929a7050657bb3fed2b806180cf19a583b2' 
  AND token = 'pJo/9ezlLV0cD67gjQQTxN5Kv7r7MItNlC/+ZJ+O9YQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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