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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4322e5a0d40448f6171cb228dfd38c56089a4992673ca6d07ad76c90ce8d7157' 
  AND token = 'nIEE9aJ0Os13F5hYz7yz9nUb/cPKhszd9MiUGcC2ge4=' 
  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"
    }
  }
}