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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d31f3d2140e4a1f2cc416ff410bcd78a5c391f7a01b4054bbf38c069bb2328e' 
  AND token = 'D9KQ6pyjNiTNo8rPL+Y5JZEalvIeKfkrgy+DyhfWBRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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