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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc16e2b7d0b7ae9659e03be725892508bb543d17454c921c3a699724a334998d' 
  AND token = 'vwA3nZ+ztw7OWMDeALYF4RqoK8ONV2EU6BUr8irwdr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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