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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75f26597b504f8707993d41e5e16917be586065cdac87ca5e37ab8d9716080bc' 
  AND token = '/GxBUGn0a/CcQ0Qum1VJv62kQzKltqUS8pLztEU6sCI=' 
  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"
    }
  }
}