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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97a52b1c887ef9f46047b3fa7947fcdfa3ba67474fb121c167ffb08e61bd4db7' 
  AND token = 'Xf0mY5jmNdIeZp98F9+t5QQMUy5F3li2EBDE5J08jfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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