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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ac5f2292a68a56d3c3cec4e859544cc5210405f6e68d50dabbb832a7628868b' 
  AND token = 'zU0Y7anzvid5WnV3yQPi5CEk3ktOvsUvCNCpH0ZQw7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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