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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '292a906f23406ed4edfbf62a6bbe8bb2413abece7945f9169806087ea8b4bc8f' 
  AND token = 'edkaS821517EPW99ZNM6iBL9EBW7GS9muzLdfmM8cbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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