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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c12ba4498d65a97a619faeede94e1b04150d8a92a1315cb736404dd1c7e87114' 
  AND token = 'zH3spY7Yuj/lDbXMAH+SXBSsj5yp8GLSySncZep+64Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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