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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf5bb20c1e6fffaa85b0558d783d3e8ce0356e1173e184471836944b8ed661dc' 
  AND token = 'qsDZX5AOpIaJH0AYrwfk1KepEJvTK0EetLaF/SszgYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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