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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9688e1caf020d9cca4884b63de4cc0d988b7d3e146adb450e2ec568690af16c' 
  AND token = 'ukm4EenXjVLr2erM4IZXkMhtxxdrS5LUtthmR7bNEuY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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