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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd75e24a423161fa03869f5149f5f195c5839d6adb632601302ee2d1ef17d200d' 
  AND token = 'oiD453tyDtqIHsFJrF82OgAAKkHT6vFqOv88wgs8dV0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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