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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6619fd9c714b5663bd83b6a5bbf1cc5a1adb7e3ba7b4dc90d9b6da161370057' 
  AND token = '+jckfpzzleJmH+3nykEmCH1D/h3bag+o45q03/2rgLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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