SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd802a8737707cd406f16ef84af8948ba455720147adf5910fc15b4f7549bd124' 
  AND token = 'TPwfvTzAPGC+GmPrJGzkbuIQgIgcKyZ9n8D6DSgZ0Kg=' 
  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"
    }
  }
}