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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ddbccf929145adad8cd7b924c853ab6af4b0ffdf100527a0d409a951510eed2' 
  AND token = 'MX5yydet4KCZYcRURuKnk7+U6vQk2rSe2YUC/p1PnnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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