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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '540eacc0172a7075c115fb7c46f07c3bf5453272ac46405609e7950d016b2357' 
  AND token = 'Je4Ht/aC+mO5bLfcMZDpKg0DOy0OlA5Mn/9f1po1/tc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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