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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36b5a0c5cb5997a1a1306d6b27ceea6f203923dd427792af6688dfb347127c92' 
  AND token = 'excw2myNU9LGxqZE/Stapa7CjmrokqIXqKk2oxT/eqo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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