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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb272da61370673666a8c349dec81951c89a50c1bae5cd0ff40e088206e36e07' 
  AND token = 'mEYn0xI3MNk92vunq+mk30atowHNA8CZDPddu8HTHCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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