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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d2c593575c68923da97c268a8478876c35fe9595f63c8c43b5ac908602c7962' 
  AND token = '1TpgPNSArxJRYtnBuT279I3sl3N+frv3vEt3QDG1hxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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