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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76d9b6456a4fe27211f38b3f6c52f0190c13803308eabbf5506b808d5e63f97e' 
  AND token = 'yas+MDzatTgVk+3UbJ3NhCqKD4nIvSiJOQyXCLdM3+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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