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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0a838864898eaab42a5f075b0f08f1b4b08cbca9391eb54f8b64c4382159165' 
  AND token = 'Pk7nEwuhGmR97LPG9L9yGMi0giM+gl9xNq7wf4I9SMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00066

JSON explain

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