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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '267668dfb7c0e6fca37593d8be06614910f6fd7fdf6f334ecef36f4f5f776c73' 
  AND token = '4EML/6TQpLvGklyghM8AQ3h65IohmKVSaKcPNVezEIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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