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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10201c1d1e634dc99b08dc71e8f93209345d935768a68e4790ad5d3a681ce146' 
  AND token = '6seD8/5zrE6bGECY3H9EzbHZpuB0s0SncnpxmxOYtRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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