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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c144913b8a3ef8e1cd2c8ac7711020f68833bde1fbda18ce7f5ee5a1b65cede3' 
  AND token = 'auYzmh1FkotN1TVgJSzKSKEE75FZ39pgLHxHL9sCBmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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