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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9173db8904025bd4597005f0d6c856485940b5f96ca8d69fd95dc3b71bd7d954' 
  AND token = 'uarx5KDcQvjGJ0i9UQsuy6cRWhLRnF4awcHbZQf9hZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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