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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1274d0397016ea99031f7ee4e1ac824be9bb83c2299ab7b8fc3b4909820a7c05' 
  AND token = 'EMmuxDhGr0Ql9vMqmTD1qqRwKXf8Wu3G4mcmC5GmLoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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