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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b448d5dd4dfbf86e8a2ce2f85a4d8dde475e8cfd636c9f4d5df5425e95fd720' 
  AND token = 'WyrhtSm5qgGBSLh81g1WSlnHHQ+ypRLsyNvhtzeImpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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