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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41d73c9ae001732fdf1e8482fe58460b5b100efd578e0f8455a754df46773f4b' 
  AND token = 'Kwq0kHb14nETSvCQse/44g0HM2i3hqTR3rFmzDuEydc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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