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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd853afe26ddd3ce31d641d3c6522b64a80ad05d11057dd515d49fa9ff3e89a28' 
  AND token = 'eV90N22c8WDd5gT//O0sgx4Ie8r9MQSTuc62zXTL7eg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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